For starters, Castrillon was cleared to resume full training with the team on Wednesday.
"It's just a matter of (Castrillon) getting timing with the ball and getting match fit," Rapids coach Oscar Pareja said of Castrillon's return. "It's a process that training is going to give him. But now we are free to give him anything we want. It may take him one week, two weeks, but Jaime now is ready to go."
Pareja is looking forward to having the team's 2012 Golden Boot winner contributing goals again this season.
"I hope so," Pareja said. "He's healthy and he's good to go. The time frame that we have is, how quick can we put him in a game mode?"
After training, Rapids Technical Director Paul Bravo informed Castrillon that the team was notified that Castrillon's U.S. Residency - more commonly referred to as green card - was approved and en route.
With green card in hand, Castrillon will no longer count as one of the club's international players.